PARTIAL PHOTO-IONIZATION CROSS-SECTIONS OF ATOMIC IODINE - IRREDUCIBLE TENSOR ANALYSIS OF INTENSITIES

The HeI photoelectron spectrum of atomic iodine has been obtained from a thermal source. The relative intensities are compared with recent data on Cl and Br. The major difference is an inversion in the relative intensities of 3P0 and 1S0 between Cl and I. An intermediate coupling angular momentum treatment, combined with spectroscopic mixing parameters, reproduces this inversion quantitatively, and, in addition, adequately describes the entire intensity pattern for all three halogens. The strong implication is that angular factors and mixing parameters are the dominant features in determining relative intensities, and radial integrals and anisotropic electron-ion interactions" are much less important. © 1979 American Institute of Physics."